[Dave at Pelican Parts]

Black with a purple stripe (denoted "black/purple") on the 914 is the tach signal wire. It plugs into the coil (-) terminal, the same one that the points plug into.

According to the diagram above, the blue/white wire is the turn signal wire (on a 914). It looks like it is plugged into a light bulb holder on your tach, which is good. The holder looks like it has two connections on it. If that is really the case, the other connection should have a ground wire connected to it. It looks to be in the wrong location, though, in the parking light indicator position.

The blue/red wire in your pic looks like it is hooked up to the turn signal indicator. I don't know what that wire carries in the Bug. It also looks to be hooked up to a two-connector light bulb, which should probably have a ground wire on it. (Unless that blue/red wire provides the ground for whatever it gets hooked to, which doesn't seem too likely.)

You have white/red wires that look to be hooked up to the instrument illumination lights. Is that what circuit they are on? Check for +12V when the headlights or parking lights are on.

On the combo gauge, it looks like three of your lights are two-connector ones, while two only have a single connector. The two-connector ones always need some power and some ground to go to them; often the power is "switched power" (red/white in a 914) that is "hot" when the key is on, and the ground is provided by the sender of whatever signal is being shown. (There are one or two exceptions, like the alternator light.)

I can't really tell what that blue/yellow wire is doing on your combo gauge. It looks like it is trying to be a power or a ground for both?

You need to figure out what the wires in your car do, and match that up with what the 914 gauges want to see. If you have a wiring diagram for the Bug, that will make it easier. If not, you will need to dig into there with a multimeter and see what has +12V under what circumstances, and what is grounded when.

--DD